/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeUserDefinedAttribute.h
UInterchangeUserDefinedAttributesAPIis used to store and retrieve user defined attributes (i.e. DCC node attributes, pipelines will have access to those attributes) Any user defined attribute have: name, value and a optional AnimationPayloadKey (FRichCurvewhich is a float curve). Value type must be supported by theUE::Interchange::EAttributeTypesenumeration.
class UInterchangeUserDefinedAttributesAPI : public [UObject](API\Runtime\CoreUObject\UObject\UObject)